Quadra 4 Operator Manual
Tomtec
174
from the obstacle. This prevents injury to you, if your hand is the obstacle, or damage to
the tips if a plate is inserted incorrectly.
When loading a rack of tips on the 450µL head, considerably more force than 10-15
pounds is required. This is accomplished with a small magnet embedded in the tip jig.
After the stage has closed the tips on the tip pins, a reed switch is actuated by the
presence of the magnet. This bypasses the safety switch and the stage goes to full power
loading the tips. The tip switch confirms that the tips are properly loaded.
The stage reaches its vertical position by counting steps to the number set in the
program. If it becomes jammed or loses steps for any reason, it must initialize. The stage
travels down to its bottom or home position. A sensor is operated at this point that resets
the software counter back to zero.
There is another potential error point. If for some reason, an attempt to lower the stage is
made when it is offset (indexed away from its home position), then it will not clear the
opening in the shuttle. This is recognized by the software and the stage error message is
given. When "escape" is pressed, a "jog stage "window will appear on the screen. The
stage can then be "jogged" (moved) accordingly using "Page Up" or "Page Down" to
remove any obstacle. DO NOT MOVE THE STAGE BY HAND-DAMAGE
MAY OCCUR.
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